Cu/BiVO_4复合光催化剂的制备及可见光催化活性(英文)

Syntheses and Activities of Visible-Light-Driven Cu/BiVO_4 Composite Photocatalysts

利用水热法制备了Cu掺杂的BiVO4复合可见光催化剂,借助X射线衍射(XRD)、X射线光电子能谱(XPS)、紫外-可见漫反射光谱(DRS)和扫描电子显微镜(SEM)对其进行表征.XRD分析显示所有催化剂都呈现单斜结构.XPS结果显示掺杂元素均以其稳定氧化态形式存在于催化剂表面.DRS谱中掺杂样品的吸收边比纯BiVO4都有不同程度的红移.以甲基橙(MO)的可见光催化降解反应为探针,研究了催化剂的可见光催化性能.结果表明,经Cu掺杂改性的催化剂的催化能力比纯BiVO4有所提高.对其掺杂增强催化能力的可能原因进行了讨论.

Cu-doped BiVO4 photocatalysts were hydrothermally synthesized and characterized by X-ray diffraction（XRD）,X-ray photoelectron spectroscopy（XPS）,UV-Vis diffuse reflectance spectroscopy（DRS）,and scanning electron microscopy（SEM）.XRD showed that all the photocatalysts have the same single monoclinic sheelite structure.XPS results show that Cu exists on the surface of the BiVO4 catalysts as their stable oxide cation species.An absorption edge red-shift was obtained by DRS studies.The photocatalytic activity was investigated using methyl orange（MO） as a photocatalytic degradation model reactant.Results showed that the Cu-doped catalysts enhanced photocatalytic activities under visible-light irradiation.An enhanced photocatalytic mechanism was also discussed.